Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/15529
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dc.contributor.authorROCHA, H. R. da
dc.contributor.authorFREITAS, H. C.
dc.contributor.authorROSOLEM, R.
dc.contributor.authorJUÁREZ, R. I. N.
dc.contributor.authorTANNUS, R. N.
dc.contributor.authorLIGO, M. A. V.
dc.contributor.authorCABRAL, O. M. R.
dc.contributor.authorDIAS, M. A. F. S.
dc.date.accessioned2017-09-19T00:13:21Z-
dc.date.available2017-09-19T00:13:21Z-
dc.date.created2007-07-03
dc.date.issued2002
dc.identifier.citationBiota Neotropica, Campinas, v. 2, n. 1, p. 1-11, 2002.
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/15529pt_BR
dc.descriptionThe technique of eddy correlation was used to measure the net ecosystem exchange over a woodland savanna (Cerrado Sensu stricto) site (Gleba Pé de Gigante) in southeast Brazil. The data set included measurements of climatological variables and soil respiration using static soil chambers. Data were collected during the period from 10 October 2000 to 30 March 2002. Measured soil respiration showed average values of 4.8 molCO m-2s-1 year round. Its 2 seasonal differences varied from 2 to 8 molCO m-2s-1 (Q = 4.9) during the dry (April to August) and wet season, respectively, and was concurrent with soil temperature and moisture variability. The net ecosystem CO2 flux (NEE) variability is controlled by solar radiation, temperature and air humidity on diel course. Seasonally, soil moisture plays a strong role by inducing litterfall, reducing canopy photosynthetic activity and soil respiration. The net sign of NEE is negative (sink) in the wet season and early dry season, with rates around -25 kgC ha-1day-1, and values as low as 40 kgC ha- 1day-1. NEE was positive (source) during most of the dry season, and changed into negative at the onset of rainy season. At critical times of soil moisture stress during the late dry season, the ecosystem experienced photosynthesis during daytime, although the net sign is positive (emission). Concurrent with dry season, the values appeared progressively positive from 5 to as much as 50 kgC ha-1day-1. The annual NEE sum appeared to be nearly in balance, or more exactly a small sink, equal to 0.1 0.3 tC ha-1yr-1, which we regard possibly as a realistic one, giving the constraining conditions imposed to the turbulent flux calculation, and favourable hypothesis of succession stages, climatic variability and CO2 fertilization.
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectSavana
dc.subjectSequestro de carbono
dc.titleMeasurements of CO2 exchange over a woodland savanna (Cerrado Sensu stricto) in southeast Brasil.
dc.typeArtigo de periódico
dc.date.updated2018-11-14T11:11:11Zpt_BR
dc.subject.thesagroCerradopt_BR
dc.subject.thesagroFotossíntesept_BR
dc.subject.thesagroRespiraçãopt_BR
riaa.ainfo.id15529
riaa.ainfo.lastupdate2018-11-14 -02:00:00
dc.contributor.institutionHUMBERTO R. da ROCHA, Departamento de Ciências Atmosféricas, IAG/Universidade de São Paulopt_BR
dc.contributor.institutionHELBER C. FREITAS, Departamento de Ciências Atmosféricas, IAG/Universidade de São Paulopt_BR
dc.contributor.institutionRAFAEL ROSOLEM, Departamento de Ciências Atmosféricas, IAG/Universidade de São Paulopt_BR
dc.contributor.institutionRobinson I.N. Juárez ROBINSON I. N. JUÁREZ, Departamento de Ciências Atmosféricas, IAG/Universidade de São Paulopt_BR
dc.contributor.institutionRAFAEL N. TANNUS, Departamento de Ciências Atmosféricas, IAG/Universidade de São Paulopt_BR
dc.contributor.institutionMARCOS ANTONIO VIEIRA LIGO, CNPMApt_BR
dc.contributor.institutionOSVALDO MACHADO RODRIGUES CABRAL, CNPMApt_BR
dc.contributor.institutionMARIA A. F. SILVA DIAS, Departamento de Ciências Atmosféricas, IAG/Universidade de São Paulo.pt_BR
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